I went to regular school from K-12 and I also felt like my social skills were significantly stunted for a long time. Which is not to say that homeschooling can’t negatively impact your social skills, but that plenty of kids experience stunted social skills, social anxiety, awkwardness, introversion even with regular schooling.

Also as an adult I gotta say, in most ways it’s traditionally schooled kids who are “stunted” (immature, have mannerisms/beliefs/habits incompatible with the adult world) until they hit about 20-26 more so than homeschool kids. I’ve met homeschooled kids who probably considered themselves stunted, and in some ways (being sheltered) they were, but they were also significantly more “adult-like” and mature in other ways earlier than their peers. This is also true for a lot of traditionally schooled kids who are “late bloomers” IME.